1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Acceleration across a floor with friction

  1. Jul 19, 2011 #1
    1. The problem statement, all variables and given/known data

    A man pushes a box full of toys that has a mass of 12kg across a floor with a force of 60 N. The box of toys and the floor have a kinetic coefficient of friction of 0.5.
    What is the acceleration of the box?

    2. Relevant equations

    3. The attempt at a solution

    Here's what I have so far. f[itex]\mu[/itex]k=12*9.8*0.5=58.8. So, since the man is pushing with 60 N of force, and the friction force is pushing back with 58.8 N, he is pushing the box with a net force of .2 N. I think, but I"m not sure, that I could just use this 0.2 as the F in F=ma, then solve for a, using 12 as m, and 0.2 as F. I'm not quite sure if this is correct though.
  2. jcsd
  3. Jul 19, 2011 #2
    Yes,it is correct.
  4. Jul 19, 2011 #3
    It's not 0.2 N, it's 1.2 N :)
  5. Jul 20, 2011 #4
    1.2 is the net force
    and according to newton's laws its equal to ma ...
  6. Jul 20, 2011 #5
    Always draw a free body diagram if your not sure if your correct or not. If you do so you would see that your correct.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Acceleration across a floor with friction